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Sedans Infiniti G35 Infiniti G35 Real World MPG
392 messages, Last post on Dec 02, 2009 at 10:55 AM
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I get 19 mpg in mixed city/freeway driving. I get 22 mpg in 80 mph cruise on the highway (sorry, cannot drive this car 70 or 75). The car always gets 87 octane regular. It has been driven this way for 29,000 miles. For those of you that think the mpg will increase if 91 or 93 octane fuel is used, I think you have your head up your gas. 
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Replying to: redz06 (Aug 19, 2005 5:58 pm)
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Replying to: frisconick (Aug 20, 2005 11:45 am) 1/ Higher octane will allow higher compression so the engine can make more horsepower. Newer computer controlled engines with good knock sensors will back off the timing to allow use of lower octane fuels. Should not damage the engine, you may notice a slight decrease in performance. I'm not sure about mileage though the above post suggests no difference. 2/ Most higher octane fuels (name brands) also contain more cleaners. Does it help in the long run??????? makes you kinda go hmmmmmmm. I lower octane works for you, go with it.
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Replying to: esfoad (Aug 25, 2005 7:01 am) Haven't used anything but Premium in it (91 recommended). Speedway sells 92, Shell 93. I seem to be able to tell a difference even between the 92 and 93. I've noticed some rattle/knocking when shutting down the engine with the 92 octane (Maybe I got a couple bad tanks of 92?). In my area, the difference between the cheap stuff and good stuff generally runs an extra dime/gallon. I'll fork over a couple bucks a tank to keep it running smooth. MPG: Drive it pretty hard sometimes (why not?): only get around 13 - 15 MPG city driving. Highway is much better. Last fillup I calculated around 21 MPG. Didn't get it for the MPG. Got for the fun! 
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I have always gotten good gas MPG on the 2003 and now on the 2005 which is rated 1 MPG lower then the 2003. HWY:at 75mph we get 27MPG CITY: from 30-55 we get 22MPG COMBO: from 30-75 we get 24.5MPG All at pretty spirited driving. We get up and go. We use 93 octane. We are not in the cheapest state but not the most exspensive either last at the pump was 08/25/05 paid $2.60 a gallon for 93 octane I live in NC |
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Drove 800 miles, all highway w/ 91+ octane (whatever was available) and got 23.5mpg (all interstate at about 75mph). Have also checked w/ 89 octane and doesn't make a bit of difference on mpg, however using 87 is not recommended (mine knocked severely) the one or two times I tried it. Gets 20-22 average (80%highway) on my commutes. I think my driving is just normal, I don't act stupid and I don't drive like a granny, but I do like to pass cars and occasionally get up to 90ish in the process. |
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Car has 30,000 mi., always premium gas, K&N air filter, synthetic oil. City commutes and daily errands: 17.4 mpg Highway (best on Atlanta-Seattle round trip - Wyoming at altitude - 75mph) 27.5 mpg.
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Replying to: cpv35 (Oct 10, 2005 5:39 pm) Commute - no highway = 17.5 mpg Trips w/ 80% highway = 23.5 mpg I'm not at all disappointed. |
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Replying to: cpv35 (Oct 10, 2005 5:39 pm) |
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Replying to: frisconick (Jul 12, 2005 7:57 am) ........ cuml mpg 0-1000 20.5 0-2000 21.2 0-3000 22.1 0-4000 22.4 The engine feels a little more eagar with premium but it is very subjective. I've taken the car on 2 longer trips and averaged about 24 mpg at 75-85 mph. I don't drive slow but I do try to drive smoothly. |
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